3,813 open source AVR/Arduino boards
ATmega and ATtiny microcontrollers, Arduino-compatible boards and Arduino shields. Every board here is a public GitHub project with its KiCad files, read for size, layers and parts. Pick one close to your design and simulate its firmware on HardLabs before you build it.
AVR/ArduinoPsyduck
lindamao-waterloop
38.1 × 25.4 mm15 parts2LNo license2
AVR/ArduinoWater sensor
ARTS-Laboratory
48.3 × 101.6 mm12 parts2LCC-BY-SA-4.02- schematic only · 24 partsAVR/Arduino
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mhered
24 parts2LNo license2 
AVR/ArduinoOrthodox
BenjaminJAnderson
253.2 × 100.8 mm135 parts2LNo license1
AVR/ArduinoArke
formicidae-tracker
72 × 36 mm44 parts2LNo license1
AVR/ArduinoProyecto V2 backup lvlsens y tempsens
NicolasSchkurko
89 × 85.7 mm42 parts2LNo license1
AVR/ArduinoSimpleClock
mwwhited
215.9 × 177.8 mm31 parts2LMIT1
AVR/ArduinoPedalBaord
uvmaero
61 × 32.2 mm22 parts2LNo license1
AVR/ArduinoAttiny84-usbc
mothenjoyer69
27.6 × 17.9 mm20 parts2LMIT1
AVR/ArduinoLF LAP TIMER
bismarx-v1
94.5 × 64.5 mm17 parts2LNo license1
AVR/ArduinoTurbotronik NT 150 360 control
ograsdijk
88.7 × 105.9 mm15 parts2LNo license1
AVR/ArduinoAtmosphere
le-flav-b
95 × 75 mm13 parts2LNo license1
AVR/ArduinoAdvent candles v 1.2
pmacik
45 × 38.6 mm10 parts2LNo license1
AVR/ArduinoAttiny85 Alarm
Stevemwa
47.4 × 40.9 mm9 parts2LNo license1
AVR/ArduinoAttiny13a breakout board
amitesh-singh
28.3 × 22.4 mm8 parts2LGPL-3.01
AVR/ArduinoN64 UltraCIC II Breakout
nelgau
12.7 × 16.5 mm4 parts2LNo license1- schematic only · 5 partsAVR/Arduino
Attiny2313
lhondareyte
5 parts2LCC-BY-4.01 
AVR/ArduinoRobust io.before r74
lusher00
160 × 100 mm259 parts4LCustom license0
AVR/ArduinoTSALG ACCUM V2
HKUST-Red-Bird-Racing-EVRT
140 × 60 mm88 parts2LNo license0
AVR/ArduinoCorne Chocolate
IndianBoy42
133.8 × 91.4 mm84 parts2LNo license0
AVR/ArduinoVizitka Michal 04
Meteopresscz
90 × 50 mm54 parts2LNo license0
AVR/ArduinoJarduino2 - Carte Power Nano Autonome
bpmine
118 × 95 mm38 parts2LNo license0
AVR/ArduinoDcc Decoder Devel Board
danielvilas
78 × 54.3 mm34 parts4LMIT0
AVR/ArduinoQ
AbdELRahmanGamiel
87.6 × 47.3 mm32 parts2LNo license0
AVR/ArduinoMotor driver2026a
daisuke-ym
50 × 50 mm32 parts2LNo license0
AVR/ArduinoController
greyltc
45.1 × 110 mm32 parts4LCERN-OHL-1.20
AVR/ArduinoDataDisplay
nunosousa
38.1 × 69.3 mm30 parts2LMIT0
AVR/ArduinoPrvni propojeni schema dmp
ANToNyS21
245 × 153.3 mm28 parts2LNo license0
AVR/ArduinoAltBoard2025
papurika37
30.5 × 35.5 mm27 parts2LNo license0
AVR/ArduinoBlinking LED
bostang
55.9 × 69.7 mm18 parts2LNo license0
AVR/ArduinoBasic nano acia
gcoonrod
17.8 × 36.6 mm16 parts4LApache-2.00
AVR/ArduinoSmd class
ep-infosec
30 × 30 mm16 parts2LCC-BY-4.00
AVR/ArduinoBase 2layer trial
Hemlock-white
100 × 98.9 mm16 parts2LNo license0
AVR/ArduinoArduino Nano Line Follower
Krzysiek-Mistrz
39.5 × 60.2 mm11 parts2LNo license0
AVR/ArduinoESP32 Programming Board V2
saadmaziz
70.3 × 58.8 mm11 parts2LMIT0
AVR/ArduinoCosmonode ext01
exostic
12.7 × 10.2 mm8 parts2LNo license0
Browse boards by part
AMS1117-3.3 1847USBLC6-2SC6 1502RP2040 1017W25Q128JVS 654AP2112K-3.3 635ESP32-S3-WROOM-1 488TL072 446L7805 43674HC595 404TL074 404CH340C 392LM358 367Pico 356USBLC6-2P6 351AP2112K-3.3TRG1 345Arduino_Nano_v3.x 317LM7805_TO220 315ProMicro 29774LS04 285ESP32-WROOM-32 285PC817 260SRV05-4 25874LS245 257TP4056 250